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1. 发明申请

US20120250799A1 BLIND SYMBOL SYNCHRONIZATION SCHEME FOR OFDM SYSTEM 有权
标题翻译：用于OFDM系统的BLIND符号同步方案
公开(公告)号：US20120250799A1
公开(公告)日：2012-10-04
申请号：US13436022
申请日：2012-03-30
申请人： Shrinivas Bhat , Vishwakumara Kayargadde , Parag Naik
发明人： Shrinivas Bhat , Vishwakumara Kayargadde , Parag Naik
IPC分类号： H04L27/22 , H04J11/00
CPC分类号： H04L27/2665 , H04L27/2032 , H04L27/2679
摘要： An Orthogonal Frequency Division Multiplexing (OFDM) receiver system for improved pilotless detection of symbol boundary of a received OFDM symbols using M-ary Phase Shift Keying (M-PSK) modulated carriers as a cost function is provided. The OFDM receiver includes a symbol boundary detection block that detects a symbol boundary of the received OFDM symbols. The symbol boundary detection block detects the symbol boundary by computing cost function of second order moment of the M-PSK modulated carriers. The receiver system is capable of detecting the symbol boundary for unknown information on said received OFDM symbols and thus increases throughput per given transmission bandwidth of a modulation scheme.
摘要翻译：提供了一种正交频分复用（OFDM）接收机系统，用于使用M-phase相移键控（M-PSK）调制载波作为成本函数来改进对接收的OFDM符号的符号边界的无引导检测。 OFDM接收机包括检测接收的OFDM符号的符号边界的符号边界检测块。符号边界检测块通过计算M-PSK调制载波的二阶矩的成本函数来检测符号边界。接收机系统能够检测所接收的OFDM符号上的未知信息的符号边界，从而增加调制方案的给定传输带宽的吞吐量。

2. 发明授权

US08665976B2 Blind symbol synchronization scheme for OFDM system 有权
标题翻译：用于OFDM系统的盲符号同步方案
公开(公告)号：US08665976B2
公开(公告)日：2014-03-04
申请号：US13436022
申请日：2012-03-30
申请人： Shrinivas Bhat , Vishwakumara Kayargadde , Parag Naik
发明人： Shrinivas Bhat , Vishwakumara Kayargadde , Parag Naik
IPC分类号： H04K1/10
CPC分类号： H04L27/2665 , H04L27/2032 , H04L27/2679
摘要： An Orthogonal Frequency Division Multiplexing (OFDM) receiver system for improved pilotless detection of symbol boundary of a received OFDM symbols using M-ary Phase Shift Keying (M-PSK) modulated carriers as a cost function. The OFDM receiver includes a symbol boundary detection block that detects a symbol boundary of the received OFDM symbols. The symbol boundary detection block detects the symbol boundary by computing a cost function of a second order moment of the M-PSK modulated carriers. The receiver system detects the symbol boundary for unknown information on the received OFDM symbols.
摘要翻译：一种正交频分复用（OFDM）接收机系统，用于使用M相移相键控（M-PSK）调制载波作为成本函数来改进对接收的OFDM符号的符号边界的无监督检测。 OFDM接收机包括检测接收的OFDM符号的符号边界的符号边界检测块。符号边界检测块通过计算M-PSK调制载波的二阶矩的成本函数来检测符号边界。接收机系统检测接收的OFDM符号上的未知信息的符号边界。

3. 发明授权

US08605806B2 Schemes for detecting guard intervals in OFDM system 有权
标题翻译：用于检测OFDM系统中的保护间隔的方案
公开(公告)号：US08605806B2
公开(公告)日：2013-12-10
申请号：US13436090
申请日：2012-03-30
申请人： S. Harish Krishnan , Shrinivas Bhat
发明人： S. Harish Krishnan , Shrinivas Bhat
IPC分类号： H04K1/10
CPC分类号： H04L27/2605 , H04L27/2663 , H04L27/2666 , H04L27/2678 , H04L27/2688
摘要： A receiver and method of detecting a guard interval estimate accurately by performing an Nth order polynomial based non-linear quantization on a pre-estimated guard interval in a received Orthogonal Frequency Division Multiplexing (OFDM) signal in a receiver is provided. The pre-estimated guard interval is obtained by performing normalized auto-correlation on the received OFDM signal. The method includes (i) performing a rounding operation on (a) one or more mth coefficient of the polynomial and (b) the pre-estimated guard interval to obtain an indexing parameter ‘k’, and detecting the guard interval estimate based on (i) a value of k, and (ii) a guard interval from one or more guard intervals that are stored in a look up table. The guard interval estimate is detected in accordance with an equation: {tilde over (L)}=L[k−4], where ‘L’ is the guard interval stored in the look up table that corresponds to the value of k.
摘要翻译：提供了一种通过在接收机中接收到的正交频分复用（OFDM）信号中对预估的保护间隔执行基于N阶多项式的非线性量化来准确地检测保护间隔估计的接收机和方法。通过对所接收的OFDM信号进行归一化的自相关来获得预估的保护间隔。该方法包括：（i）对（a）多项式的一个或多个第m个系数和（b）预估的保护间隔执行舍入操作以获得索引参数'k'，并且基于（ i）值k，以及（ii）存储在查找表中的一个或多个保护间隔的保护间隔。根据以下等式来检测保护间隔估计：{tilde over（L）} = L [k-4]，其中“L”是存储在查找表中对应于k的值的保护间隔。

4. 发明申请

US20120250807A1 SCHEMES FOR DETECTING GUARD INTERVALS IN OFDM SYSTEM 有权
标题翻译：用于检测OFDM系统中的卫星间隔的方案
公开(公告)号：US20120250807A1
公开(公告)日：2012-10-04
申请号：US13436090
申请日：2012-03-30
申请人： S. Harish Krishnan , Shrinivas Bhat
发明人： S. Harish Krishnan , Shrinivas Bhat
IPC分类号： H04L27/06
CPC分类号： H04L27/2605 , H04L27/2663 , H04L27/2666 , H04L27/2678 , H04L27/2688
摘要： A receiver and method of detecting a guard interval estimate accurately by performing an Nth order polynomial based non-linear quantization on a pre-estimated guard interval in a received Orthogonal Frequency Division Multiplexing (OFDM) signal in a receiver is provided. The pre-estimated guard interval is obtained by performing normalized auto-correlation on the received OFDM signal. The method includes (i) performing a rounding operation on (a) one or more mth coefficient of the polynomial and (b) the pre-estimated guard interval to obtain an indexing parameter ‘k’, and detecting the guard interval estimate based on (i) a value of k, and (ii) a guard interval from one or more guard intervals that are stored in a look up table. The guard interval estimate is detected in accordance with an equation: {tilde over (L)}=L[k−4], where ‘L’ is the guard interval stored in the look up table that corresponds to the value of k.
摘要翻译：提供了一种通过在接收机中接收到的正交频分复用（OFDM）信号中对预估的保护间隔执行基于N阶多项式的非线性量化来准确地检测保护间隔估计的接收机和方法。通过对所接收的OFDM信号进行归一化的自相关来获得预估的保护间隔。该方法包括（i）对（a）多项式的一个或多个第m个系数和（b）预估保护间隔执行舍入运算以获得索引参数k，并且基于（i）检测保护间隔估计， k的值，以及（ii）存储在查询表中的一个或多个保护间隔的保护间隔。根据以下等式来检测保护间隔估计：{tilde over（L）} = L [k-4]，其中L是存储在查找表中对应于k的值的保护间隔。

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