公开(公告)号：US20160182201A1

公开(公告)日：2016-06-23

申请号：US14866748

申请日：2015-09-25

Applicant: QUALCOMM Incorporated

Inventor： Jing Jiang ,  Joseph Binamira Soriaga ,  Krishna Kiran Mukkavilli ,  Tingfang Ji ,  Huilin Xu ,  Naga Bhushan ,  Raghuraman Krishnamoorthi ,  Peter Pui Lok Ang ,  John Edward Smee

IPC: H04L5/00 ,  H04W72/04 ,  H04L25/02 ,  H04L12/801

CPC classification number: H04L5/0048 ,  H04L5/0026 ,  H04L5/005 ,  H04L25/0202 ,  H04L27/2613 ,  H04L47/12 ,  H04W72/0446 ,  H04W72/0453 ,  H04W72/0466

Abstract: Systems and techniques are disclosed to reduce pilot overhead by providing common reference signals coded with cover codes that are orthogonal in time and frequency domains. Common reference signals that are coded by cover codes orthogonal in both domains can be de-spread in both the time and frequency domains for improved resolution and larger pull-in windows for both. Also disclosed is semi-uniform pilot spacing in both the frequency and time domains. In a time domain, a first pilot symbol pair is spaced by a first time interval from each other and a second pilot symbol pair is spaced by a second time interval from the first pair, the second interval being greater than the first. In a frequency domain, a first set of pilot symbols is densely placed in a selected frequency band and a second set of pilot symbols is sparsely placed surrounding and including the selected frequency band.

Abstract translation: 公开了系统和技术，以通过提供用时间和频域正交的覆盖码编码的公共参考信号来减少导频开销。 通过在两个域中正交的覆盖码编码的公共参考信号可以在时域和频域两者中解扩，以改善分辨率和较大的两个拉入窗口。 还公开了频域和时域中的半均匀导频间隔。 在时域中，第一导频符号对彼此间隔第一时间间隔，并且第二导频符号对与第一对间隔第二时间间隔，第二间隔大于第一间隔。 在频域中，第一组导频符号密集地放置在所选频带中，并且第二组导频符号被稀疏地放置在包围所选频带的周围。

公开(公告)号：US20130229955A1

公开(公告)日：2013-09-05

申请号：US13781394

申请日：2013-02-28

Applicant: QUALCOMM INCORPORATED

Inventor： Huilin Xu ,  Raghu Narayan Challa ,  Hisham A. Mahmoud

IPC: H04W52/18

CPC classification number: H04W52/18 ,  H04B17/101 ,  H04W48/16 ,  H04W52/143

Abstract: A method, an apparatus, and a computer program product for wireless communication are provided in which a set of time intervals is obtained from a received radio frequency signal. A power profile is determined for a frequency spectrum segment in each time interval. A first list is used to identify frequency spectrum segments that exhibit a power or energy profile over a range of frequencies associated with a downlink channel bandwidth, and a second list is used to identify frequency spectrum segments that have a total or average energy greater than a threshold energy relative to a noise floor. An absolute radio frequency channel number (ARFCN) of a wireless communication system is determined based on the time intervals identified in the first and second lists.

Abstract translation: 提供一种用于无线通信的方法，装置和计算机程序产品，其中从接收的射频信号获得一组时间间隔。 在每个时间间隔内为频谱段确定功率曲线。 第一列表用于识别在与下行链路信道带宽相关联的频率范围上呈现功率或能量分布的频谱段，并且第二列表用于识别具有大于或等于的总频谱或平均能量的频谱段 相对于本底噪声的阈值能量。 基于在第一和第二列表中识别的时间间隔来确定无线通信系统的绝对射频信道号（ARFCN）。