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1. 发明申请

US20050226341A1 Decision feedback channel estimation and pilot tracking for OFDM systems 有权
标题翻译： OFDM系统的决策反馈信道估计和导频跟踪
公开(公告)号：US20050226341A1
公开(公告)日：2005-10-13
申请号：US11150619
申请日：2005-06-10
申请人： Qinfang Sun , Won-Joon Choi , Jeffrey Gilbert , Ning Zhang , Yi-Hsiu Wang , Tao-Fei Ng
发明人： Qinfang Sun , Won-Joon Choi , Jeffrey Gilbert , Ning Zhang , Yi-Hsiu Wang , Tao-Fei Ng
IPC分类号： H04L25/02 , H04L25/03 , H04L27/26 , H04L27/28
CPC分类号： H04L25/022 , H04L25/0236 , H04L27/2647 , H04L2025/03522
摘要： Current OFDM systems use a limited number of symbols and/or sub-channels to provide approximations for channel estimations and pilot tracking, i.e. phase estimations. For example, two training symbols in the preamble of a data packet are used to provide channel estimation. Four of the fifty-four sub-channels are reserved for providing phase estimation. However, noise and other imperfections can cause errors in both of these estimations, thereby degrading system performance. Advantageously, decision feedback mechanisms can be provided to significantly improve channel estimation and pilot tracking in OFDM systems. The decision feedback mechanisms can use data symbols in the data packet to improve channel estimation as well as data sub-channels to improve pilot tracking.
摘要翻译：当前OFDM系统使用有限数量的符号和/或子信道来提供用于信道估计和导频跟踪（即相位估计）的近似。例如，使用数据分组的前导码中的两个训练符号来提供信道估计。五十四个子通道中的四个保留用于提供相位估计。然而，噪声和其他缺陷可能会导致这两种估计中的错误，从而降低系统性能。有利地，可以提供决策反馈机制以显着地改善OFDM系统中的信道估计和导频跟踪。决策反馈机制可以使用数据分组中的数据符号来改进信道估计以及数据子信道，以改进导频跟踪。

2. 发明申请

US20050059366A1 Spur mitigation techniques 审中-公开
标题翻译：刺激减轻技术
公开(公告)号：US20050059366A1
公开(公告)日：2005-03-17
申请号：US10664792
申请日：2003-09-16
申请人： Won-Joon Choi , Jeffrey Gilbert , Yi-Hsiu Wang , Xiaoru Zhang
发明人： Won-Joon Choi , Jeffrey Gilbert , Yi-Hsiu Wang , Xiaoru Zhang
IPC分类号： H04L27/26 , H04B1/00
CPC分类号： H04L25/0232 , H04L1/0045 , H04L27/2647
摘要： Spurs cause significant problems with signal detecting, amplifier gain adjustment, and signal decoding. Various techniques can be used to mitigate the effects of spurs on a received signal. Generally, these techniques work by either canceling or ignoring the spurs. For example, a pilot mask can be used to ignore pilot information in one or more sub-channels. A Viterbi mask can determine the weighting given to bits in a sub-channel based on spur and data rate information. Channel interpolation can compute a pseudo channel estimate for a sub-channel known to have a spur location can be computed by interpolating the channel estimates of adjacent good sub-channels. Filtering of the received signal using a low-pass filter, a growing box filter, or a low-pass filter with self-correlation can be used to cancel a spur.
摘要翻译：马刺在信号检测，放大器增益调整和信号解码方面造成重大问题。可以使用各种技术来减轻杂散对接收信号的影响。一般来说，这些技术通过取消或忽略杂散来工作。例如，可以使用导频掩码来忽略一个或多个子信道中的导频信息。维特比掩码可以基于支线和数据速率信息来确定子信道中的比特的加权。信道内插可以计算已知具有支路位置的子信道的伪信道估计，可以通过内插相邻的良好子信道的信道估计来计算。使用低通滤波器，增长盒滤波器或具有自相关的低通滤波器对接收信号进行滤波可以用于取消杂散。

3. 发明申请

US20050152314A1 Multiple-input multiple output system and method 有权
标题翻译：多输入多输出系统及方法
公开(公告)号：US20050152314A1
公开(公告)日：2005-07-14
申请号：US10981145
申请日：2004-11-03
申请人： Qinfang Sun , Won-Joon Choi , Jeffrey Gilbert , Ardavan Tehrani
发明人： Qinfang Sun , Won-Joon Choi , Jeffrey Gilbert , Ardavan Tehrani
IPC分类号： H04L20060101 , H04Q7/00
CPC分类号： H04B7/0421 , H04B7/0413 , H04B7/0613 , H04B7/0684 , H04L1/0041 , H04L1/0054 , H04L1/0061 , H04L1/06 , H04L1/0656 , H04L1/1819 , H04L1/1829 , H04L5/0048 , H04L25/0204 , H04L25/0226 , H04L27/0014 , H04L2025/03426
摘要： A multiple-input multiple-output (MIMO) system can transmit on multiple antennas simultaneously and receive on multiple antennas simultaneously. Unfortunately, because a legacy 802.11a/g device is not able to decode multiple data streams, such a legacy device may “stomp” on a MIMO packet by transmitting before the transmission of the MIMO packet is complete. Therefore, MIMO systems and methods are provided herein to allow legacy devices to decode the length of a MIMO packet and to restrain from transmitting during that period. These MIMO systems and methods are optimized for efficient transmission of MIMO packets.
摘要翻译：多输入多输出（MIMO）系统可以同时在多个天线上进行发射并同时在多个天线上进行接收。不幸的是，由于遗留802.11a / g设备不能解码多个数据流，所以这样的传统设备可能在完成MIMO分组的传输之前通过发送来“踩踏”MIMO分组。因此，本文提供MIMO系统和方法，以允许传统设备对MIMO分组的长度进行解码并且在该时间段内抑制发射。这些MIMO系统和方法被优化用于MIMO分组的有效传输。

4. 发明申请

US20050243774A1 Repetition coding for a wireless system 有权
标题翻译：无线系统的重复编码
公开(公告)号：US20050243774A1
公开(公告)日：2005-11-03
申请号：US10666952
申请日：2003-09-17
申请人： Won-Joon Choi , Qinfang Sun , Jeffrey Gilbert
发明人： Won-Joon Choi , Qinfang Sun , Jeffrey Gilbert
IPC分类号： H04L1/08 , H04B7/216
CPC分类号： H04L1/08 , H04L1/0071
摘要： A system and method are disclosed for transmitting data over a wireless channel. In some embodiments, transmitting data includes receiving convolutionally encoded data and enhancing the transmission of the data by further repetition encoding the data.
摘要翻译：公开了一种通过无线信道发送数据的系统和方法。在一些实施例中，发送数据包括接收卷积编码的数据，并通过进一步重复编码数据来增强数据的传输。

5. 发明申请

US20070206695A1 Selecting MCS in a MIMO system 有权
标题翻译：在MIMO系统中选择MCS
公开(公告)号：US20070206695A1
公开(公告)日：2007-09-06
申请号：US11329978
申请日：2006-01-10
申请人： Huanchun Ye , Won-Joon Choi , Ning Zhang , Jeffrey Gilbert
发明人： Huanchun Ye , Won-Joon Choi , Ning Zhang , Jeffrey Gilbert
IPC分类号： H04L1/02
CPC分类号： H04L27/2608 , H04B7/02 , H04L1/0003 , H04L1/0009 , H04L1/0015 , H04L1/0016 , H04L1/0025 , H04L1/20
摘要： An accurate total error rate performance can be measured using a computed error vector magnitude (EVM) per stream. Using this EVM, the receiver or the transmitter can advantageously generate an optimized modulation and coding scheme (MCS) that corresponds to a specific number of streams, modulation and coding rate for the transmitter. For example, the receiver can compute an SNR from the EVM and then use an SNR vs. MCS table to determine the optimized MCS. In contrast, the transmitter can receive an EVM-to-RSSI mapping and an EVM-to-MCS mapping from the receiver. These mappings and an EVM can facilitate selecting the optimized MCS.
摘要翻译：可以使用每个流的计算误差向量幅度（EVM）来测量精确的总错误率性能。使用该EVM，接收机或发射机可以有利地生成对应于发射机的特定数量的流，调制和编码速率的优化的调制和编码方案（MCS）。例如，接收机可以从EVM计算SNR，然后使用SNR对MCS表来确定优化的MCS。相比之下，发射机可以从接收机接收EVM到RSSI映射和EVM到MCS映射。这些映射和EVM可以促进选择优化的MCS。

6. 发明申请

US20070041322A1 Rate adaptation using semi-open loop technique 审中-公开
标题翻译：使用半开环技术进行速率调整
公开(公告)号：US20070041322A1
公开(公告)日：2007-02-22
申请号：US11329979
申请日：2006-01-10
申请人： Won-Joon Choi , Ning Zhang , Huanchun Ye , Jeffrey Gilbert
发明人： Won-Joon Choi , Ning Zhang , Huanchun Ye , Jeffrey Gilbert
IPC分类号： H04J1/16
CPC分类号： H04W52/24 , G01R29/26 , H04B7/0413 , H04L1/0002 , H04L1/0003 , H04L1/0009 , H04L1/0016 , H04L1/1607 , H04L1/20 , H04L25/0204 , H04L47/10 , H04L47/263
摘要： In a semi-open loop rate adaptation scheme for a multiple-input multiple-output (MIMO) system, a transmitter can advantageously use one or more quality metrics of an uplink as well as knowledge of device characteristics of both ends to perform fast and accurate rate adaptation.
摘要翻译：在用于多输入多输出（MIMO）系统的半开环速率适配方案中，发射机可以有利地使用上行链路的一个或多个质量度量以及两端的设备特性的知识来执行快速和准确的速率适应

7. 发明申请

US20050078649A1 Apparatus and method of multiple antenna receiver combining of high data rate wideband packetized wireless communication signals 有权
标题翻译：多天线接收机组合高数据率宽带分组化无线通信信号的装置和方法
公开(公告)号：US20050078649A1
公开(公告)日：2005-04-14
申请号：US10682787
申请日：2003-10-08
申请人： Ardavan Tehrani , Won-Joon Choi , Jeffrey Gilbert , Yi Wang
发明人： Ardavan Tehrani , Won-Joon Choi , Jeffrey Gilbert , Yi Wang
IPC分类号： H04B7/08 , H04L27/26 , H04J1/00
CPC分类号： H04L27/2657 , H04B7/0845 , H04B7/0848 , H04L27/2663 , H04L27/2665 , H04L27/2675
摘要： The present invention provides an apparatus and method of multiple antenna receiver combining of high data rate wideband packetized wireless communication signals, where the apparatus includes M receive antennas, receiving M high data rate wideband packetized wireless communication signals, where each of the signals includes N frequency bins. The apparatus, in an exemplary embodiment, includes (1) a joint timing recovery units that perform joint coarse signal timing estimation, joint frequency offset estimation, and joint fine timing estimation on each of the signals, (2) M Fast Fourier Transform units (FFTs) that each convert the digital data for each of the M signals into frequency domain information for each of the N received frequencies and that output Q pilots for each of the signals, where Q is a positive integer, and (3) a combiner that weights and combines the outputs of the M FFTs for each of the N received frequencies.
摘要翻译：本发明提供了一种多天线接收机组合的高数据率宽带分组化无线通信信号的装置和方法，其中该装置包括M个接收天线，接收M个高数据速率宽带分组化无线通信信号，其中每个信号包括N个频率箱子。在一个示例性实施例中，该装置包括（1）联合定时恢复单元，其对每个信号执行联合粗略信号定时估计，联合频率偏移估计和联合精细定时估计，（2）M个快速傅里叶变换单元 FFT），其将每个M个信号的数字数据转换为N个接收频率中的每一个的频域信息，并且为每个信号输出Q个导频，其中Q是正整数，以及（3）组合器，对N个接收频率中的每一个进行加权并组合M FFT的输出。

8. 发明申请

US20070274407A1 Decoding System And Method For Digital Communications 有权
标题翻译：数字通信解码系统和方法
公开(公告)号：US20070274407A1
公开(公告)日：2007-11-29
申请号：US11621940
申请日：2007-01-10
申请人： John Thomson , Paul Husted , Ardavan Tehrani , Jeffrey Gilbert , William McFarland , Lars Thon , Yi-Hsiu Wang
发明人： John Thomson , Paul Husted , Ardavan Tehrani , Jeffrey Gilbert , William McFarland , Lars Thon , Yi-Hsiu Wang
IPC分类号： H04K1/10 , H03D1/00
CPC分类号： H04L25/067 , H03M13/25 , H03M13/3961 , H03M13/41 , H03M13/6325 , H03M13/6362 , H04K3/228 , H04L1/005 , H04L1/0054 , H04L27/38
摘要： A Viterbi decoding system interprets bits in received QAM constellations as many-valued parameters rather than binary valued parameters. It performs the Viterbi algorithm using these many-valued parameters to provide results superior to hard decision decoding. Rather than applying a hard 0-1 function to the QAM data, the system uses a non-stepped linear or curved transfer function to assign values to the bits. In another aspect, a system differentiates between data bits based on their estimated reliability, giving more emphasis to decoding reliable bits than unreliable bits using any of a variety of techniques. By differentiating between god and bad bits and de-emphasizing or ignoring unreliable bits, the system can provide a significant reduction in uncorrectable errors and packet loss.
摘要翻译：维特比解码系统将接收的QAM星座中的比特解释为多值参数，而不是二进制值参数。它使用这些多值参数来执行维特比算法，以提供优于硬判决解码的结果。系统使用非阶梯线性或弯曲传递函数来向位指定值，而不是将硬0-1函数应用于QAM数据。在另一方面，一种系统基于其估计的可靠性来区分数据比特，更多地强调使用各种技术中的任何一种来解码可靠比特比不可靠比特。通过区分神和坏位，并且不强调或忽略不可靠比特，系统可以显着减少不可校正的错误和分组丢失。

9. 发明申请

US20050078763A1 Apparatus and method of multiple antenna transmitter beamforming of high data rate wideband packetized wireless communication signals 有权
标题翻译：高数据率宽带分组化无线通信信号的多天线发射机波束成形的装置和方法
公开(公告)号：US20050078763A1
公开(公告)日：2005-04-14
申请号：US10682381
申请日：2003-10-08
申请人： Won-Joon Choi , Ardavan Tehrani , Jeffrey Gilbert , Samuel Ng
发明人： Won-Joon Choi , Ardavan Tehrani , Jeffrey Gilbert , Samuel Ng
IPC分类号： H04B7/06 , H04L25/02 , H04L27/26 , H04B7/02 , H04L1/02
CPC分类号： H04L27/2626 , H04B7/0617 , H04L25/0206 , H04L27/2608 , H04L27/2614
摘要： The present invention provides an apparatus and method of multiple antenna transmitter beamforming of high data rate wideband packetized wireless communication signals, where each of the signals comprises N frequencies, where N is a positive integer. The apparatus, in an exemplary embodiment, includes (1) a transmit beamformer that co-phases and weights the signals for each of the N frequencies across M antennas, thereby generating M co-phased and weighted frequency data and (2) M Inverse Fast Fourier Transform units (IFFTs) that convert the M co-phased and weighted frequency data into M digital outputs, and M transmit antennas transmitting the M co-phased and weighted signals, where M is an integer greater than or equal to 2.
摘要翻译：本发明提供了一种高数据速率宽带分组化无线通信信号的多天线发射机波束成形的装置和方法，其中每个信号包括N个频率，其中N是正整数。在示例性实施例中，该装置包括：（1）发射波束形成器，其对M个天线中的每个N个频率的信号进行共相并加权，由此产生M个同相和加权的频率数据;（2）M 将M个相位和加权频率数据转换为M个数字输出的傅里叶变换单元（IFFT），以及发射M个同相加权信号的M个发射天线，其中M是大于或等于2的整数。

10. 发明申请

US20060146869A1 Dynamic channel bandwidth management 有权
标题翻译：动态频道带宽管理
公开(公告)号：US20060146869A1
公开(公告)日：2006-07-06
申请号：US11193017
申请日：2005-07-29
申请人： Ning Zhang , Jeffrey Gilbert
发明人： Ning Zhang , Jeffrey Gilbert
IPC分类号： H04J3/22
CPC分类号： H04W28/20 , H04K3/226 , H04K3/822 , H04K2203/18 , H04W76/20 , H04W88/06
摘要： To provide an extra wide bandwidth communication using standard channels, multiple non-overlapping channels can be used. To provide a 40 MHz communication, two non-overlapping 20 MHz channels, i.e. a control channel and an extension channel, can be used to provide an effective 40 MHz channel. Advantageously, a wireless device can dynamically detect 20/40 MHz signals on a packet-by-packet basis, thereby facilitating commercially viable 40 MHz communication. The wireless device can monitor traffic on the extension channel to facilitate accurate 20/40 MHz decision making. Protection, e.g. legacy preambles and RTS/CTS headers, can be provided on the control and extension channels.
摘要翻译：为了使用标准信道提供额外的宽带宽通信，可以使用多个非重叠信道。为了提供40MHz通信，可以使用两个不重叠的20MHz信道，即控制信道和扩展信道，以提供有效的40MHz信道。有利地，无线设备可以逐个分组地动态地检测20/40MHz信号，从而促进商业上可行的40MHz通信。无线设备可以监控扩展通道上的流量，以便于准确的20/40 MHz决策。保护，例如传统的前导码和RTS / CTS标头可以在控制和扩展通道上提供。

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