公开(公告)号：US08605806B2

公开(公告)日：2013-12-10

申请号：US13436090

申请日：2012-03-30

Applicant: S. Harish Krishnan ,  Shrinivas Bhat

Inventor： S. Harish Krishnan ,  Shrinivas Bhat

IPC: H04K1/10

CPC classification number: H04L27/2605 ,  H04L27/2663 ,  H04L27/2666 ,  H04L27/2678 ,  H04L27/2688

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20120250799A1

公开(公告)日：2012-10-04

申请号：US13436022

申请日：2012-03-30

Applicant: Shrinivas Bhat ,  Vishwakumara Kayargadde ,  Parag Naik

Inventor： Shrinivas Bhat ,  Vishwakumara Kayargadde ,  Parag Naik

IPC: H04L27/22 ,  H04J11/00

CPC classification number: H04L27/2665 ,  H04L27/2032 ,  H04L27/2679

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20120250807A1

公开(公告)日：2012-10-04

申请号：US13436090

申请日：2012-03-30

Applicant: S. Harish Krishnan ,  Shrinivas Bhat

Inventor： S. Harish Krishnan ,  Shrinivas Bhat

IPC: H04L27/06

CPC classification number: H04L27/2605 ,  H04L27/2663 ,  H04L27/2666 ,  H04L27/2678 ,  H04L27/2688

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US08665976B2

公开(公告)日：2014-03-04

申请号：US13436022

申请日：2012-03-30

Applicant: Shrinivas Bhat ,  Vishwakumara Kayargadde ,  Parag Naik

Inventor： Shrinivas Bhat ,  Vishwakumara Kayargadde ,  Parag Naik

IPC: H04K1/10

CPC classification number: H04L27/2665 ,  H04L27/2032 ,  H04L27/2679

Abstract: 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.

Abstract translation: 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。