公开(公告)号：US20150229493A1

公开(公告)日：2015-08-13

申请号：US14519660

申请日：2014-10-21

Applicant: Samsung Electronics Co., Ltd.

Inventor： Jungwon LEE ,  Yingqun YU ,  Sungsoo KIM ,  CheolHee LEE

IPC: H04L25/02 ,  H04L5/00

CPC classification number: H04L25/022 ,  H04L5/0023 ,  H04L5/0051 ,  H04L25/0234 ,  H04L25/0242 ,  H04L25/0256

Abstract: Methods, apparatuses, and systems for improved channel estimation in an Orthogonal Frequency Division Multiplexing (OFDM) system are discussed. In one example discussed herein, joint two-dimensional Minimum Mean-Square Error (2D-MMSE) channel estimation is performed on any Resource Element (REs) containing a reference signal in a Resource Block (RB), one-dimensional Minimum Mean-Square Error (1D-MMSE) channel estimation is performed in the frequency domain on each OFDM symbol in the RB, and then channel estimation is performed in the time domain on each frequency sub-carrier in the RB. In another example discussed herein, Power Delay Profiles (PDPs) and/or frequency correlations are calculated using minimax optimization and then stored in a Look-Up Table (LUT) indexed by estimated Signal to Noise Ratio (SNR) and the estimated maximum delay spread. A portable device could use such an LUT in MMSE calculations.

Abstract translation: 讨论了正交频分复用（OFDM）系统中用于改进信道估计的方法，装置和系统。 在本文中讨论的一个示例中，对包含资源块（RB）中的参考信号的任何资源元素（RE）执行联合二维最小均方误差（2D-MMSE）信道估计，一维最小均方 在RB中的每个OFDM符号的频域中执行误差（1D-MMSE）信道估计，然后在RB中的每个频率子载波上的时域中执行信道估计。 在本文讨论的另一示例中，使用最小化优化来计算功率延迟分布（PDP）和/或频率相关，然后存储在由估计的信噪比（SNR）和估计的最大延迟扩展索引的查找表（LUT）中 。 便携式设备可以在MMSE计算中使用这样的LUT。

公开(公告)号：US20150230173A1

公开(公告)日：2015-08-13

申请号：US14564733

申请日：2014-12-09

Applicant: Samsung Electronics Co., Ltd.

Inventor： Linbo LI ,  Jaber BORRAN ,  Yingqun YU ,  Inyup KANG

IPC: H04W52/02 ,  H04W72/04

CPC classification number: H04W52/0212 ,  H04W52/0229 ,  H04W72/042 ,  Y02D70/1262 ,  Y02D70/168

Abstract: A method and an apparatus are provided for determining whether an enhanced physical downlink control channel (ePDCCH) transmission exists for a user equipment (UE) in a subframe. The UE receives a transmission on physical downlink control channel (PDCCH) resources of the subframe. Downlink control information (DCI) is extracted from the PDCCH resources. The DCI includes at least one bit indicating whether the ePDCCH transmission exists for the UE in the subframe. The UE determines whether the ePDCCH transmission exists using the at least one bit. Additional symbols of the subframe are buffered and decoded when the ePDCCH transmission exists.

Abstract translation: 提供了一种用于确定在子帧中是否存在针对用户设备（UE）的增强物理下行链路控制信道（ePDCCH）传输的方法和装置。 UE在子帧的物理下行链路控制信道（PDCCH）资源上接收传输。 从PDCCH资源提取下行链路控制信息（DCI）。 DCI包括至少一个位，指示在子帧中UE是否存在ePDCCH传输。 UE确定使用至少一个比特是否存在ePDCCH传输。 当存在ePDCCH传输时，子帧的附加符号被缓冲和解码。