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41. 发明授权

US07924941B2 Digital pre-distortion for orthogonal frequency division multiplexing (OFDM) signals 有权
标题翻译：正交频分复用（OFDM）信号的数字预失真
公开(公告)号：US07924941B2
公开(公告)日：2011-04-12
申请号：US11945415
申请日：2007-11-27
申请人： Xiaoyong Yu
发明人： Xiaoyong Yu
IPC分类号： H04K1/02
CPC分类号： H04L27/2624
摘要： A method (300) and a system (100) for processing an orthogonal frequency division multiplexing (OFDM) signal. At least one portion of an OFDM symbol (125) that exceeds an amplitude limiting threshold can be identified. The identified portion of the OFDM symbol (125) can be filtered to generate a pre-distortion noise (145). The OFDM symbol (125) and the pre-distortion noise (145) can be combined to generate a pre-distorted OFDM symbol (165).
摘要翻译：一种用于处理正交频分复用（OFDM）信号的方法（300）和系统（100）。可以识别超过限幅阈值的OFDM符号（125）的至少一部分。可以对OFDM符号（125）的识别部分进行滤波以产生预失真噪声（145）。可以组合OFDM符号（125）和预失真噪声（145）以产生预失真的OFDM符号（165）。

42. 发明授权

US07782755B2 Method for uplink collaborative SDMA user pairing in WIMAX 有权
标题翻译： WIMAX上行协作SDMA用户配对方法
公开(公告)号：US07782755B2
公开(公告)日：2010-08-24
申请号：US11962132
申请日：2007-12-21
申请人： Xiaoyong Yu
发明人： Xiaoyong Yu
IPC分类号： H04J11/00
CPC分类号： H04L5/0023 , H04L5/0037 , H04L5/0062 , H04L25/0204
摘要： A method, system, and communication network for grouping a pair of independent information signals on the same time-frequency orthogonal frequency division multiplexing (OFDM) resources for uplink (UL) collaborative SDMA, in a wireless communication system. An uplink scheduling (ULS) utility employs an estimated channel gain associated with the transmission path(s) of each user to create a pairing metric that effectively computes the correlation between each pair of independent information signals on a specific sub-carrier frequency channel. Pairs of information signals are considered as possible groupings when the values of the corresponding pairing metrics are less than a threshold maximum value. An optimal selection of final pairings is based on the relative values of the pairing metric(s) and other priority conditions which may include quality of service requirements. The ULS utility enables the UL scheduler to pair information signals with a clear spatial distinction and minimal correlation.
摘要翻译：一种用于在无线通信系统中对用于上行链路（UL）协作SDMA的相同时频正交频分复用（OFDM）资源分组一对独立信息信号的方法，系统和通信网络。上行链路调度（ULS）实用程序使用与每个用户的传输路径相关联的估计信道增益来创建有效地计算特定副载波频率信道上的每对独立信息信号之间的相关性的配对度量。当相应配对度量的值小于阈值最大值时，对信息信号被认为是可能的分组。最终配对的最佳选择是基于配对度量和可能包括服务质量要求的其他优先级条件的相对值。 ULS实用程序使得UL调度器能够以明确的空间区别和最小的相关性对信息信号。

43. 发明申请

US20070133697A1 Method and system for synchoronizing a receiver in an OFDM system 有权
标题翻译：在OFDM系统中同步接收机的方法和系统
公开(公告)号：US20070133697A1
公开(公告)日：2007-06-14
申请号：US11301403
申请日：2005-12-13
申请人： Gregory Spock , Xiaoyong Yu
发明人： Gregory Spock , Xiaoyong Yu
IPC分类号： H04K1/10
CPC分类号： H04L27/2662 , H04L27/2657 , H04L27/2672 , H04L27/2675 , H04L27/2679
摘要： Method and system for synchronizing a receiver in an Orthogonal Frequency Division Multiplexing (OFDM) system. The method comprises transforming (105) a received signal from the time domain into the frequency domain to produce a transformed signal. The method further comprises rotating (110) each set of ranging tones of the transformed signal in the frequency domain based on a corresponding tone index to produce a set of phase-rotated frequency domain received ranging tones that is equivalent to time domain shifted ranging signals. Each ranging tone is rotated iteratively over a predefined set of delay-values and each delay-value within the predefined set of delay-values ranges from zero to a predetermined time delay. Also, the method comprises computing (115) a detection metric corresponding to each delay-value within the predefined set of delay-values based on the set of phase-rotated frequency domain received ranging tones.
摘要翻译：用于在正交频分复用（OFDM）系统中同步接收机的方法和系统。该方法包括将接收信号从时域变换（105）到频域以产生变换信号。该方法还包括基于对应的音调索引来旋转（110）频域中的变换信号的每组测距音调，以产生相当于时域偏移测距信号的一组相位旋转的频域接收的测距音调。每个测距音在预定义的一组延迟值上迭代地旋转，并且预定义的一组延迟值内的每个延迟值的范围从零到预定的时间延迟。此外，该方法包括基于相位旋转的频域接收测距音调的集合来计算（115）对应于预定义的一组延迟值内的每个延迟值的检测度量。

44. 发明授权

US06584143B2 Method and apparatus for joint detection of a coded signal in a CDMA system 失效
公开(公告)号：US06584143B2
公开(公告)日：2003-06-24
申请号：US09798305
申请日：2001-03-02
申请人： Xiaoyong Yu
发明人： Xiaoyong Yu
IPC分类号： H04B1707
CPC分类号： H04L1/005 , H04L25/03057
摘要： The present invention addresses the deficiencies of prior art joint detection techniques by implementing the decision feedback equalizer part of a joint detector in the turbo decoding iteration loop such that joint detection and turbo decoding are performed interactively in a mutual support fashion. Thus, the decoder (230) benefits from ISI and MAI suppressed samples provided by the equalizer, while the decision feedback equalizer is fed with more reliable hard decisions for the transmitted symbols by the turbo decoder.

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