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21. 发明授权

US07280467B2 Pilot transmission schemes for wireless multi-carrier communication systems 有权
标题翻译：无线多载波通信系统的导频传输方案
公开(公告)号：US07280467B2
公开(公告)日：2007-10-09
申请号：US10359811
申请日：2003-02-07
申请人： John Smee , Jay Rod Walton , Durga Prasad Malladi
发明人： John Smee , Jay Rod Walton , Durga Prasad Malladi
IPC分类号： H04J11/00 , H04B7/216 , H04B1/06
CPC分类号： H04L5/0039 , H04B7/0669 , H04B7/0854 , H04L1/0017 , H04L1/0071 , H04L1/0618 , H04L5/0023 , H04L5/0048 , H04L25/0226 , H04L25/03343 , H04L25/03866 , H04L27/2602 , H04L27/261
摘要： Pilot transmission schemes suitable for use in wireless multi-carrier (e.g., OFDM) communication systems. These pilot transmission schemes may utilize frequency, time, or both frequency and time orthogonality to achieve orthogonality among the pilots transmitted by multiple base stations on the downlink. Frequency orthogonality is achieved by transmitting pilots on disjoint sets of subbands. Time orthogonality is achieved by transmitting pilots using different orthogonal codes (e.g., Walsh codes). The pilots may also be scrambled with different scrambling codes, which are used to randomize pilot interference and to enable identification of the transmitters of these pilots. Pilot interference cancellation may be performed to improve performance since subbands used for data transmission by one transmitter may also be used for pilot transmission by another transmitter. Pilot interference is estimated and then subtracted from received symbols to obtain pilot-canceled symbols having improved quality.
摘要翻译：适用于无线多载波（例如，OFDM）通信系统的导频传输方案。这些导频传输方案可以利用频率，时间或频率和时间两个正交性来实现在下行链路上由多个基站发送的导频之间的正交性。通过在不相交的子带集合上发送导频来实现频率正交性。通过使用不同的正交码（例如沃尔什码）发射导频来实现时间正交性。导频还可以用不同的扰码进行加扰，这些扰码用于随机化导频干扰并且能够识别这些飞行员的发射机。可以执行导频干扰消除以改善性能，因为用于一个发射机的数据传输的子带也可以用于另一发射机的导频传输。导频干扰被估计，然后从接收到的符号中减去以获得具有改进质量的导频消除符号。

22. 发明申请

US20070086513A1 SYSTEM AND METHOD FOR ADJUSTING COMBINER WEIGHTS USING AN ADAPTIVE ALGORITHM IN WIRELESS COMMUNICATIONS SYSTEM 有权
标题翻译：使用无线通信系统中的自适应算法调整组合权重的系统和方法
公开(公告)号：US20070086513A1
公开(公告)日：2007-04-19
申请号：US11564824
申请日：2006-11-29
申请人： Ivan Fernandez-Corbaton , John Smee , Srikant Jayaraman
发明人： Ivan Fernandez-Corbaton , John Smee , Srikant Jayaraman
IPC分类号： H04B1/00
CPC分类号： H04B1/712 , H04B7/0854 , H04B7/0897 , H04B2201/70701
摘要： Method and apparatus to compute the combiner coefficients for wireless communication systems using an adaptive algorithm. One embodiment trains the weights on a signal known a priori that is time multiplexed with other signals, such as a pilot signal in a High Data Rate, HDR, system, wherein the signal is transmitted at full power. The adaptive algorithm recursively computes the weights during the pilot interval and applies the weights generated to the traffic signals. In one embodiment, the algorithm is a recursive least squares algorithm employing a transversal filter and weight calculation unit.
摘要翻译：使用自适应算法计算无线通信系统的组合器系数的方法和装置。一个实施例对先前已知的与其他信号进行时间复用的信号（例如高数据速率，HDR，系统中的导频信号）来训练权重，其中信号以全功率发送。自适应算法递归地计算导频间隔期间的权重，并将生成的权重应用于业务信号。在一个实施例中，算法是采用横向滤波器和权重计算单元的递归最小二乘法算法。

23. 发明申请

US20060286954A1 Method and apparatus for matching receiver carrier frequency 有权
公开(公告)号：US20060286954A1
公开(公告)日：2006-12-21
申请号：US11509388
申请日：2006-08-23
申请人： Ivan Fernandez-Corbaton , John Smee , Srikant Jayaraman
发明人： Ivan Fernandez-Corbaton , John Smee , Srikant Jayaraman
IPC分类号： H04B1/06 , H04B7/00
CPC分类号： H04L27/0014 , H03J7/04 , H04B1/707 , H04L2027/0028 , H04L2027/0055 , H04L2027/0067 , H04L2027/0095
摘要： A carrier recovery method and apparatus using multiple stages of carrier frequency recovery are disclosed. A receiver uses multiple frequency generation sources to generate carrier signals used to downconvert a received signal. An analog frequency reference having a wide frequency range and coarse frequency resolution is used in conjunction with a digital frequency reference having a narrow frequency range and fine frequency resolution. The multiple carrier signals are multiplied by a received signal to effect a multi-stage downconversion, resulting in a baseband signal. A frequency tracking module measures the residual frequency error present in the baseband signal. The measured residual frequency error is then used to adjust the frequencies of the carrier signals generated by the multiple frequency generation sources.

24. 发明申请

US20060109926A1 Method and apparatus for transmitting data in a time division duplexed (TDD) communication system 有权
公开(公告)号：US20060109926A1
公开(公告)日：2006-05-25
申请号：US11328807
申请日：2006-01-09
申请人： Ahmad Jalali , John Smee , Mark Wallace
发明人： Ahmad Jalali , John Smee , Mark Wallace
IPC分类号： H04K1/10 , H04B7/212 , H04L1/02
CPC分类号： H04L1/0032 , H04B7/0434 , H04B7/0626 , H04L1/0003 , H04L1/0013 , H04L1/0026 , H04L1/0034 , H04L1/06 , H04L5/0023 , H04L25/0204 , H04L25/0224 , H04L25/0226 , H04L25/03343 , H04L27/2647 , H04L2025/03414 , H04L2025/03426
摘要： Techniques to process data for transmission in a time division duplexed (TDD) communication system. In one aspect, the frequency response of a forward link is estimated at a base station based on reverse link transmissions (e.g., pilots) from a terminal. Prior to a data transmission on the forward link, the base station determines a reverse transfer function based on the pilots transmitted by the terminal, “calibrates” the reverse transfer function with a calibration function to derive an estimate of a forward transfer function, and preconditions modulation symbols based on weights derived from the forward transfer function. In another aspect, the terminal estimates the “quality” of the forward link and provides this information to the base station. The base station then uses the information to properly code and modulate data prior to transmission such that the transmitted data can be received by the terminal at the desired level of performance.

25. 发明授权

US06987797B2 Non-parametric matched filter receiver for wireless communication systems 失效
标题翻译：用于无线通信系统的非参数匹配滤波器接收器
公开(公告)号：US06987797B2
公开(公告)日：2006-01-17
申请号：US10206631
申请日：2002-07-26
申请人： Ivan Jesus Fernandez-Corbaton , John Smee , Srikant Jayaraman
发明人： Ivan Jesus Fernandez-Corbaton , John Smee , Srikant Jayaraman
IPC分类号： H04B1/707
CPC分类号： H04B1/7093 , H04B1/7105 , H04B1/7115 , H04L25/0212 , H04L25/0224 , H04L25/03038 , H04L2025/0342 , H04L2025/0377
摘要： A non-parametric matched filter receiver that includes a digital (e.g., FIR) filter and a channel estimator. The channel estimator (1) determines the timing to center the digital filter, (2) obtains the characteristics of the noise in received samples, (3) estimates the system response for the samples using a best linear unbiased (BLU) estimator, a correlating estimator, or some other type of estimator, and (4) derives a set of coefficients for the digital filter based on the estimated system response and the determined noise characteristics. The correlating estimator correlates the samples with their known values to obtain the estimated system response. The BLU estimator pre-processes the samples to whiten the noise, correlates the whitened samples with their known values, and applies a correction factor to obtain the estimated system response. The digital filter then filters the samples with the set of coefficients to provide demodulated symbols.
摘要翻译：包括数字（例如FIR）滤波器和信道估计器的非参数匹配滤波器接收机。信道估计器（1）确定数字滤波器中心的定时，（2）获得接收样本中噪声的特性，（3）使用最佳线性无偏估计（BLU）估计样本估计系统响应，相关估计器或某种其他类型的估计器，以及（4）基于估计的系统响应和所确定的噪声特性导出用于数字滤波器的一组系数。相关估计器将样本与其已知值相关联以获得估计的系统响应。 BLU估计器预处理样本以增白噪声，将白化样本与其已知值相关联，并应用校正因子以获得估计的系统响应。数字滤波器然后用该组系数对样本进行滤波，以提供解调符号。

26. 发明申请

US20050111599A1 Multi-antenna transmission for spatial division multiple access 有权
标题翻译：用于空分多址的多天线传输
公开(公告)号：US20050111599A1
公开(公告)日：2005-05-26
申请号：US10719802
申请日：2003-11-21
申请人： J. Walton , John Ketchum , John Smee , Mark Wallace , Steven Howard
发明人： J. Walton , John Ketchum , John Smee , Mark Wallace , Steven Howard
IPC分类号： H04B7/06 , H04J11/00 , H04L5/02 , H04Q7/36 , H04L1/02
CPC分类号： H04B7/043 , H04B1/71072 , H04B7/0408 , H04B7/0413 , H04B7/0421 , H04B7/0617 , H04B7/0619 , H04B7/0697 , H04B17/309 , H04L5/023 , H04W16/28
摘要： An uplink channel response matrix is obtained for each terminal and decomposed to obtain a steering vector used by the terminal to transmit on the uplink. An “effective” uplink channel response vector is formed for each terminal based on its steering vector and its channel response matrix. Multiple sets of terminals are evaluated based on their effective channel response vectors to determine the best set (e.g., with highest overall throughput) for uplink transmission. Each selected terminal performs spatial processing on its data symbol stream with its steering vector and transmits its spatially processed data symbol stream to an access point. The multiple selected terminals simultaneously transmit their data symbol streams via their respective MIMO channels to the access point. The access point performs receiver spatial processing on its received symbol streams in accordance with a receiver spatial processing technique to recover the data symbol streams transmitted by the selected terminals.
摘要翻译：获得每个终端的上行链路信道响应矩阵，并对其进行分解，得到终端在上行链路上使用的导向矢量。基于其导向向量及其信道响应矩阵，为每个终端形成“有效”上行链路信道响应向量。基于其有效信道响应向量来评估多组终端，以确定用于上行链路传输的最佳集合（例如具有最高总吞吐量）。每个选择的终端利用其导向向量对其数据符号流执行空间处理，并将其空间处理的数据符号流发送到接入点。多个选择的终端通过其相应的MIMO信道同时将其数据符号流发送到接入点。接入点根据接收机空间处理技术对其接收到的符号流执行接收机空间处理，以恢复由所选终端发送的数据符号流。

27. 发明申请

US20050083888A1 Forward link handoff for wireless communication systems with OFDM forward link and CDMA reverse link 有权
标题翻译：具有OFDM正向链路和CDMA反向链路的无线通信系统的前向链路切换
公开(公告)号：US20050083888A1
公开(公告)日：2005-04-21
申请号：US10744373
申请日：2003-12-22
申请人： John Smee , Jay Walton , Durga Malladi , Serge Willenegger
发明人： John Smee , Jay Walton , Durga Malladi , Serge Willenegger
IPC分类号： H04W36/08 , H04Q7/00
CPC分类号： H04W36/30
摘要： A method and apparatus for performing handoff in a wireless communication system with multi-carrier modulation (MCM) for a forward link and CDMA for a reverse link. In one embodiment, a method of performing handoff on the forward link for a terminal is provided in which signal quality of pilots received by the terminal from a plurality of base stations in the system is determined. A particular base station for subsequent data transmission on the forward link to the terminal is selected based on the signal quality determined for the plurality of base stations. A request to be handed off to the particular base station is initiated if the particular base station is different than a currently selected base station.
摘要翻译：一种用于在用于前向链路的多载波调制（MCM）和用于反向链路的CDMA的无线通信系统中执行切换的方法和装置。在一个实施例中，提供了一种在终端的前向链路上执行切换的方法，其中终端从系统中的多个基站接收的导频的信号质量被确定。基于为多个基站确定的信号质量来选择用于在到终端的前向链路上的后续数据传输的特定基站。如果特定基站不同于当前选择的基站，则启动要切换到特定基站的请求。

28. 发明授权

US07616935B2 Method and apparatus for matching receiver carrier frequency 有权
标题翻译：接收机载波频率匹配的方法和装置
公开(公告)号：US07616935B2
公开(公告)日：2009-11-10
申请号：US11509388
申请日：2006-08-23
申请人： Ivan Jesus Fernandez-Corbaton , John Smee , Srikant Jayaraman
发明人： Ivan Jesus Fernandez-Corbaton , John Smee , Srikant Jayaraman
IPC分类号： H04B1/06 , H04L27/00
CPC分类号： H04L27/0014 , H03J7/04 , H04B1/707 , H04L2027/0028 , H04L2027/0055 , H04L2027/0067 , H04L2027/0095
摘要： A carrier recovery method and apparatus using multiple stages of carrier frequency recovery are disclosed. A receiver uses multiple frequency generation sources to generate carrier signals used to downconvert a received signal. An analog frequency reference having a wide frequency range and coarse frequency resolution is used in conjunction with a digital frequency reference having a narrow frequency range and fine frequency resolution. The multiple carrier signals are multiplied by a received signal to effect a multi-stage downconversion, resulting in a baseband signal. A frequency tracking module measures the residual frequency error present in the baseband signal. The measured residual frequency error is then used to adjust the frequencies of the carrier signals generated by the multiple frequency generation sources.
摘要翻译：公开了使用多级载波频率恢复的载波恢复方法和装置。接收机使用多个频率产生源来产生用于下变频接收信号的载波信号。具有宽频率范围和粗略频率分辨率的模拟频率参考与具有窄频率范围和精细频率分辨率的数字频率参考相结合使用。多载波信号乘以接收信号以进行多级下变频，产生基带信号。频率跟踪模块测量存在于基带信号中的残余频率误差。然后，测量的残余频率误差用于调整由多个频率发生源产生的载波信号的频率。

29. 发明申请

US20080037681A1 MULTI-ANTENNA TRANSMISSION FOR SPATIAL DIVISION MULTIPLE ACCESS 审中-公开
公开(公告)号：US20080037681A1
公开(公告)日：2008-02-14
申请号：US11869596
申请日：2007-10-09
申请人： J. Walton , John Ketchum , John Smee , Mark Wallace , Steven Howard
发明人： J. Walton , John Ketchum , John Smee , Mark Wallace , Steven Howard
IPC分类号： H04B7/02 , H04L23/02
CPC分类号： H04B7/043 , H04B1/71072 , H04B7/0408 , H04B7/0413 , H04B7/0421 , H04B7/0617 , H04B7/0619 , H04B7/0697 , H04B17/309 , H04L5/023 , H04W16/28
摘要： An uplink channel response matrix is obtained for each terminal and decomposed to obtain a steering vector used by the terminal to transmit on the uplink. An “effective” uplink channel response vector is formed for each terminal based on its steering vector and its channel response matrix. Multiple sets of terminals are evaluated based on their effective channel response vectors to determine the best set (e.g., with highest overall throughput) for uplink transmission. Each selected terminal performs spatial processing on its data symbol stream with its steering vector and transmits its spatially processed data symbol stream to an access point. The multiple selected terminals simultaneously transmit their data symbol streams via their respective MIMO channels to the access point. The access point performs receiver spatial processing on its received symbol streams in accordance with a receiver spatial processing technique to recover the data symbol streams transmitted by the selected terminals.

30. 发明授权

US07099642B2 Method and apparatus for matching receiver carrier frequency 有权
公开(公告)号：US07099642B2
公开(公告)日：2006-08-29
申请号：US10112469
申请日：2002-03-29
申请人： Ivan Jesus Fernandez-Corbaton , John Smee , Srikant Jayaraman
发明人： Ivan Jesus Fernandez-Corbaton , John Smee , Srikant Jayaraman
IPC分类号： H04B1/06 , H04L27/06
CPC分类号： H04L27/0014 , H03J7/04 , H04B1/707 , H04L2027/0028 , H04L2027/0055 , H04L2027/0067 , H04L2027/0095
摘要： A carrier recovery method and apparatus using multiple stages of carrier frequency recovery are disclosed. A receiver uses multiple frequency generation sources to generate carrier signals used to downconvert a received signal. An analog frequency reference having a wide frequency range and coarse frequency resolution is used in conjunction with a digital frequency reference having a narrow frequency range and fine frequency resolution. The multiple carrier signals are multiplied by a received signal to effect a multi-stage downconversion, resulting in a baseband signal. A frequency tracking module measures the residual frequency error present in the baseband signal. The measured residual frequency error is then used to adjust the frequencies of the carrier signals generated by the multiple frequency generation sources.

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