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61. 发明申请

US20080159449A1 METHODS AND APPARATUSES FOR REDUCING INTER-CARRIER INTERFERENCE IN AN OFDM SYSTEM 失效
标题翻译：用于减少OFDM系统中的载波间干扰的方法和装置
公开(公告)号：US20080159449A1
公开(公告)日：2008-07-03
申请号：US11674632
申请日：2007-02-13
申请人： Tao Tian , Raghuraman Krishnamoorthi , Krishna Kiran Mukkavilli , Fuyun Ling
发明人： Tao Tian , Raghuraman Krishnamoorthi , Krishna Kiran Mukkavilli , Fuyun Ling
IPC分类号： H04L25/08
CPC分类号： H04L27/2657
摘要： An OFDM telecommunications system includes a transmitter and a receiver. The receiver includes a canceller configured to reduce inter-carrier interference (ICI) in an OFDM symbol in the frequency domain.
摘要翻译： OFDM电信系统包括发射机和接收机。接收机包括被配置为减少频域中的OFDM符号中的载波间干扰（ICI）的消除器。

62. 发明申请

US20080123540A1 METHODS AND APPARATUS FOR SIGNAL AND INTERFERENCE ENERGY ESTIMATION IN A COMMUNICATION SYSTEM 有权
标题翻译：通信系统中信号和干扰能量估计的方法和装置
公开(公告)号：US20080123540A1
公开(公告)日：2008-05-29
申请号：US11563627
申请日：2006-11-27
申请人： Ashok Mantravadi , Fuyun Ling , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi
发明人： Ashok Mantravadi , Fuyun Ling , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi
IPC分类号： H04J1/16
CPC分类号： H04B1/1027
摘要： Methods and apparatus for signal and interference energy estimation in a communication system. In an aspect, a method includes setting a threshold value, and comparing a channel estimate to the threshold value to determine an interference estimate (Iest). The method also includes averaging the interference estimate (Iest) to determine average channel interference (Ic), and determining interference energy (I) based on the interference estimate (Iest) and the average channel interference (Ic). In another aspect, an apparatus includes threshold logic configured to set a threshold value and compare a channel estimate to the threshold value to determine an interference estimate (Iest). The apparatus includes averaging logic configured to average the interference estimate (Iest) to determine average channel interference (Ic), and summing logic configured to determine interference energy (I) based on the interference estimate (Iest) and average channel interference (Ic).
摘要翻译：通信系统中信号和干扰能量估计的方法和装置。一方面，一种方法包括设置阈值，以及将信道估计与阈值进行比较，以确定干扰估计（I est）。该方法还包括对干扰估计进行平均以确定平均信道干扰（I SUB），以及基于干扰估计（I）来确定干扰能量（I）＆lt; SUB＆gt;）和平均信道干扰（I SUB）。在另一方面，一种装置包括阈值逻辑，其配置成设置阈值并将信道估计与阈值进行比较以确定干扰估计（I est）。所述装置包括被配置为平均干扰估计（I＆gt;）以确定平均信道干扰（I SUB）的平均逻辑，以及被配置为确定干扰能量（I）基于干扰估计（I EST）和平均信道干扰（I SUB）。

63. 发明授权

US07336727B2 Generalized m-rank beamformers for MIMO systems using successive quantization 有权
标题翻译：使用连续量化的MIMO系统的广义m级波束形成器
公开(公告)号：US07336727B2
公开(公告)日：2008-02-26
申请号：US10923056
申请日：2004-08-19
申请人： Krishna Kiran Mukkavilli , Ashutosh Sabharwal , Behnaam Aazhang
发明人： Krishna Kiran Mukkavilli , Ashutosh Sabharwal , Behnaam Aazhang
IPC分类号： H04L27/00
CPC分类号： H04B7/0417 , H04B7/043 , H04B7/0443 , H04B7/0634 , H04B7/0639 , H04B7/0663
摘要： The telecommunications system described herein implements a multi-rank beamformer for use in wireless systems equipped with multiple transmit and multiple receive antennas. The multi-rank beamformer uses finite-rate feedback of channel conditions to achieves close to theoretical performance indicated by the water-filling algorithm, while avoiding the computational complexity associated with space time codes. In addition, the multi-rank beamforming system described herein improves on the performance of unit rank beamforming methods by maintaining the gains over space time codes over a broader range of transmission rates.
摘要翻译：本文描述的电信系统实现用于配备有多个发射和多个接收天线的无线系统中的多等级波束形成器。多级波束形成器使用信道条件的有限速率反馈来实现接近灌水算法所指示的理论性能，同时避免与时空码相关的计算复杂度。另外，本文描述的多级波束成形系统通过在更宽的传输速率范围内保持空间时间码的增益来改善单位秩波束成形方法的性能。

64. 发明授权

US07330701B2 Low complexity beamformers for multiple transmit and receive antennas 失效
标题翻译：用于多个发射和接收天线的低复杂度波束形成器
公开(公告)号：US07330701B2
公开(公告)日：2008-02-12
申请号：US10533248
申请日：2003-10-29
申请人： Krishna Kiran Mukkavilli , Ashutosh Sabharwal , Behnaam Aazhang
发明人： Krishna Kiran Mukkavilli , Ashutosh Sabharwal , Behnaam Aazhang
IPC分类号： H04B1/00 , H04B7/00
CPC分类号： H04B7/0639 , H01Q21/00 , H04B7/0443 , H04B7/0617 , H04B7/0669 , H04W52/42
摘要： Beamforming systems having a few bits of channel state information fed back to the transmitter benefit from low complexity decoding structures and performances gains compared with systems that do not have channel state feedback. Both unit rank and higher rank systems are implemented. Substantial design effort may be avoided by following a method of using functions formulated for space-time systems with the change that the channel coherence time is equated to the number of transmit antennas and the number of antennas in the space-time formulation is fixed at one.
摘要翻译：具有反馈到发射机的几比特信道状态信息的波束成形系统与没有信道状态反馈的系统相比，受益于低复杂性解码结构和性能增益。实现了单位级和高级制。通过遵循使用为空时系统制定的功能的方法可以避免大量的设计努力，其中信道相干时间等于发射天线的数量，并且时空公式中的天线数量固定在一个。

65. 发明申请

US20070153924A1 Methods and apparatus for noise estimation in a communication system 有权
标题翻译：通信系统中噪声估计的方法和装置
公开(公告)号：US20070153924A1
公开(公告)日：2007-07-05
申请号：US11516910
申请日：2006-09-06
申请人： Fuyun Ling , Krishna Kiran Mukkavilli , Gordon Kent Walker
发明人： Fuyun Ling , Krishna Kiran Mukkavilli , Gordon Kent Walker
IPC分类号： H04K1/10
CPC分类号： H04L1/20 , H04L27/2602 , H04L27/2647
摘要： Methods and apparatus for noise estimation in a communication system. In an aspect, a method for noise and interference estimation is provided. The method includes identifying one or more unmodulated subcarriers in a received waveform, processing the one or more unmodulated subcarriers to produce a demodulated output, and determining a noise variance based on the demodulated output. In another aspect, an apparatus for providing a noise and interference estimation is provided. The apparatus includes selection logic configured to identify one or more unmodulated subcarriers in a received waveform, a processor configured to demodulate the one or more unmodulated subcarriers to produce a demodulated output, and variance determination logic configured to determine a noise variance based on the demodulated output.
摘要翻译：通信系统中噪声估计的方法和装置。在一方面，提供了一种用于噪声和干扰估计的方法。该方法包括识别接收波形中的一个或多个未调制副载波，处理一个或多个未调制副载波以产生解调输出，以及基于解调输出确定噪声方差。另一方面，提供了一种用于提供噪声和干扰估计的装置。所述设备包括被配置为识别接收波形中的一个或多个未调制子载波的选择逻辑，被配置为对所述一个或多个未调制子载波进行解调以产生解调输出的处理器，以及配置为基于解调输出来确定噪声方差的方差确定逻辑。

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