公开(公告)号：US20140140423A1

公开(公告)日：2014-05-22

申请号：US14170111

申请日：2014-01-31

Applicant: STMICROELECTRONICS, INC. ,  STMICROELECTRONICS ASIA PACIFIC PTE LTD.

Inventor： Karthik MURALIDHAR ,  George A. VLANTIS

IPC: H04L25/03 ,  H04B7/04

CPC classification number: H04L25/03821 ,  H04B7/0413 ,  H04L5/0048 ,  H04L25/0204 ,  H04L25/022 ,  H04L25/0226 ,  H04L27/2601

Abstract: In an embodiment, a transmitter includes a transmission path configurable to generate first pilot clusters in response to a matrix, each first pilot cluster including a respective first pilot subsymbol in a first cluster position and a respective second pilot subsymbol in a second cluster position such that a vector formed by the first pilot subsymbols is orthogonal to a vector formed by the second pilot subsymbols, the matrix having a dimension related to a number of cluster positions in each of the first pilot clusters. For example, where such a transmitter transmits simultaneous orthogonal-frequency-division-multiplexed (OFDM) signals (e.g., MIMO-OFDM signals) over respective channels that may impart inter-carrier interference (ICI) to the signals due to Doppler spread, the pattern of the pilot symbols that compose the pilot clusters may allow a receiver of these signals to estimate the responses of these channels more accurately than conventional receivers.

Abstract translation: 在实施例中，发射机包括可配置为响应于矩阵生成第一导频簇的传输路径，每个第一导频簇包括第一簇位置中的相应第一导频子符号和第二簇位置中的相应第二导频子符号，使得 由第一导频子符号形成的矢量与由第二导频子符号形成的矢量正交，该矩阵具有与每个第一导频簇中的簇的位置数相关的维数。 例如，在这种发射机通过可能由于多普勒扩展而给予信号的载波间干扰（ICI）的相应信道上发射同时正交频分复用（OFDM）信号（例如，MIMO-OFDM信号）的情况下， 构成导频簇的导频符号的模式可以允许这些信号的接收机比常规接收机更准确地估计这些信道的响应。

公开(公告)号：US20140128004A1

公开(公告)日：2014-05-08

申请号：US13672326

申请日：2012-11-08

Applicant: STMICROELECTRONICS ASIA PACIFIC PTE LTD.

Inventor： Karthik MURALIDHAR ,  Sapna GEORGE ,  Saurav SAHU ,  Frank TEO

IPC: H04B17/00

CPC classification number: H04B17/13 ,  H04L25/05

Abstract: In an embodiment, an apparatus includes a determiner, converter, adapter, and modifier. The determiner is configured to generate a representation of a difference between a first frequency at which a first signal is sampled and a second frequency at which a second signal is sampled, and the converter is configured to generate a second sample of the first signal at a second time in response to the representation and a first sample of the first signal at a first time. The adapter is configured to generate a sample of a modifier signal in response to the second sample of the first signal, and the modifier is configured to generate a modified sample of the second signal in response to a sample of the second signal and the sample of the modifier signal. For example, such an apparatus may be able to reduce the magnitude of an echo signal in a system having an audio pickup (e.g., a microphone) near an audio output (e.g., a speaker).

Abstract translation: 在一个实施例中，装置包括确定器，转换器，适配器和修改器。 确定器被配置为产生第一信号被采样的第一频率与第二信号被采样的第二频率之间的差异的表示，并且转换器被配置为在第一频率处产生第一信号的第二采样 第二次响应于第一次的表示和第一个信号的第一个样本。 适配器被配置为响应于第一信号的第二样本产生修改器信号的样本，并且修改器被配置为响应于第二信号的样本和第二信号的样本而生成第二信号的修改样本 修改信号。 例如，这样的装置可能能够减小在音频输出（例如扬声器）附近具有音频拾取器（例如，麦克风）的系统中的回波信号的幅度。